Thread-milling machine



C. H. SCHURR AND E. l. LEES.

Pand oon 19,1920.

fnl/enivre y that' allg.

C. H. SCHURH AND E. l. LEES.

THREAD MILLING MACHINE.

APPLmAnoN man muA r, Isla. l

Patented 0st. 19, 1920.

4 sHE1s SMU s.

C. H. SCHUBR AND E. I. LEES. THREAD MILLING MACHINE.

APPLICATION FILED IAN. 7, I9|8.

1,355,854. Patented 'om 19,1920.

4 SHEEI S-SHEET 4.

y inially.

UNITED STATES CHARLES H. AND ERNEST J'. LEES, 0F CLEVELAND, HIO, LEES-BRADNER C0., F

PATENT OFFICE.

ASSIGN-OBS T0 THE CLEVELAND, OHIO.

THREAD-MILLING MACHINE.

'Application med January 7, 191s.

To all whom t may concern Thread-Milling (lur invention Be it known that We, CHAnLns H. SCHURR and Elnalls'r` J. Lans, both citizens of the United States of America, residing at 6210 Carnegie Ave., Y city of Cleveland, in the county of Cuyahoga and State of Ohio, have invented a new and useful Improvement in Machines, of which the following is a specification, the principle of the invention being herein explained and the best mode in which we have contemplated applying that principle, so as to'distinguish it from other inventions.

Our invention is related to a thread milling machine and more particularly/to a. single improvement associated with the train of gears commonly employed to predetermlne the coordination or rela-tive rates of speed between some particular spindle and the lead screw.

Heretofore, power thus transmitted at the head stock was taken from a `projectin 3; end extremity or stud of a reduction spindle, which stud, of course, made a given number of revolutions andlcould be satisfactorilyy connected by a train of ars to the lead screw for liner pitches. gli the case, however, of long leazls it was necessary, if the gearing was to li ewise extend between such single reduction spindle and the lead screw, to recompute and re-arrange such gearing. comprehends the simple idea of having a second more rapidly rotatin spindle extremit serveas al1-additional stud from whence the gear reduction to the screw could be taken for longer leads.

We would have it expressly understood that we in no ivise limit ourselves to this creoific application or embodiment of our invention, which we have selected as a basis for illustrating and describingr our jinvention merely for the purpose of rendering a clear and comprehensive understanding of the scope and novel features thereof.

Adv'erting `to the drawings:

Figure I is a front elevation of a thread milling machine embodying our invention.

II'is a head stock end elevationof the same.

Fig. III is an enlarged horizontal section of the head stock end of the machine to disclose the manner' in which power is transmitted.

i, Fig. IV is a corres iondingly enlarged vcr- 4`tical section on line lV-IV of Fig. I.

Specification ot Letterslatent.

Patented Oct. 19, 1920. serial No. 210,633.

Fig. V is a partial .front elevation to similar scale showing certain internal driving connections in dotted lines.

Fi is a vertical VI I of-Fig. V.

Fig. VII is a vertical section on line V IIT-VII of Fig. V.

Fig. VIII is an end elevation, of one detail of the mechanism.

Fig. IX is a section on line IX- IX of Fi VIII.

section on line ower originates at the loose and fast puhV leys 1 and 2 respectively seen in Fig II, and from there may be cursorily traced in so far as its route of transmission is common in the machines upon which this invention is a. slight though certain and important improvement. The shaft 3 is rotated by the tight pulley 2 and such movement is communicated through gears 4 and 5 to a spline shaft 6 leading in the customary manner to the cutter 'drive carried by a swivel head. The shaft 3 transmits power to mechanism both for rotating the blank and for effecting the lead of thetool. It carries loosely the bevel pinions 7 each of which meshes with a bevel gear 8 upon a cross shaft 9 leading to the front of the machine as appears in Fig. IV. A clutch 8 is adapted to transmit the drive to the shaft 9 from either pinion and therefore in opposite directions. The latter continuously drives a. bevel pinion 10 which in turn drives a bevel gear 11 on a short shaft 12 as maybe clearly seen in Fig. V.

Such shaft 12 drives a gear 13 which meshes with a gear 14 loosely mounted on a shaft 15 whereby the latter, when clutched thereto` may be driven ata given speed. Upon the end of the shaft 9 is another pinion 16 engaging With a wheel 17 on a shaft 18,` The latter has mounted upon it a pinion 19 which meshes with a large gear 20 secured to a higher spindle 21 which is fashioned with a worm 22 as is shown in detail in Fig. VI. The Worm 22 serves to drive the' Worm wheel 23 likewise loosely mounted on the shaft 15 and designed to rotate the same if clutched thereto at a slower rate of speed than through the agency ofthe gear 14. A clutch 24 operated by a lever 25 is adapted to fix either the gear 14 or Wheel 23 to theshaft l5' whereby to rapidly move the work or to more slowly drive it as required duringl the cutting operation, respectively, as will later become evident.

That part ofthe machine which our preeent invention is more particularly associated is hest disclosed in Figs. ll, V and VU, the former being an end view, the next an ele vation of a portion of the front with the parts incloscd thereby, a gear box cover appearing in dotted lines and the laad bemg a vertical cross section lookin toward the end illustrated in Fig. Il. e secoi'idary driving shaft l5 carries near its extremity a pinion 26 which meshes with a gear 27 near the inner end of a spindle 28. outwardly adjacent the gear 26 and likewise upon the spindle 15 is a pinion Z9 which meshes with a gear 3l) on another lower and necessarily more slowly moving spindle 3l. Similarly mounted upon the spindle 31 inwardly adjacent the gear 3() is a pinion which engages a lar geen 33 that is keyed to the inner end o a lower and still. more slowly moving spindle 34. The other end of the spindle 3l projects outwardly beyond and serves as a driving stud 35, being there provided with a spline 36 and securing nut 37. As so arten .d the stud 35 constitutes what will be refgeired to as t'heslow or ordinary source from whih ower may be and heretofore always hhs geen communicated according to a redetermined harmonious relation throng a train of gears. Such train is commonly known as the indexing train and ma be varied at will according to the lead which it is r uired to impart for the particular job. t should be understood that the indexing train has been omitted from F V in order more clearly to show that the first gear forming a part thereof and which is to be secured upon the stud 35 is to be removably secured thereto for the double purpose of allowing the substitution thereor of a` ar having a different number of teeth and sides so that the indexing train. ma have its power ince .tion elsewhere ad wil now be explained. he feature of ont invention consists in having the spindle 28 also project outwardly beyond the machine to serve as another splinedstud 38 from which power may be alternatively taken through the indexingvtrain consisting of the bodily shiftable gears 39, 40, 41, 42 and 43, thel last mentioned of which is secured to the splined extremity 44 of the lead shaft 45. The stud 38 is necessarily rotating faster than the stud and in fact, upon machines which we have built, so as to'rotate twelve tunes as fast. By thus making two studs available where heretofore there has been. only one, from either of which power may be" communicated through the indexing train, we have been enabled greatly to sirnphfy the computation' and rearrangement of the indexing train for dido-rent jobs.

Keyed to the shaft 15 is a mon 46 which meshes with a large r 7 similarly secured to the work spindlet. it is manifed that the rotation of such spindle in different directions and at different speeds is readily debemined by the clutch control lever 25.

The inion 46 carries a sleeve extension 49 i to w ich an indexing wheel is attached, h means oil its huh 5l, To the hub 5l a p ate 52 is screwed and the latter is provided with holes [ifi for receiving a pin 54 which is mounted in an arm This arm 55 is slidebly splined on the secondary drive shaft 'lo and therefore always rotates with this shaft. isrotating and the pin 54 is in one of. the holes 53, the pinion 46 is caused to rotate which in turn rotates the work. `When it is desired to index the work after the driving shaft 15 has stopped, the arm 55 is moved to the right until the pin 54 is disengaged. whatever number of revolutions and fraiction of a revolution may be necessary'to properlyY index the work; It is a comparatively simple matter for the operator to re member the numl'ier of complete revolutions required for each indexin but the fraction of the revolution is more iiliult. To overcome this difficulty we have provided two rings mounted one upon the other and which ma be tersely described because not new an not claimed. One ring 56 is provided with a pointer 57 and the other ring .58 has a pointer 59, and is rotatably mounted on the sleeve 49. The ring 58 is frictionally held against rotation by means of an ordinary wire spring (not shown) and is to be rotated until the pointer 59 is in line with the pin` whereupon Vthe other ring 56 is rotated until its pointer 57 indicates the frac tion of the revolution through which'eit be- `cornes necessary to turn the indexing wheel.

For instance if it is necessa to turn the hand wheel 5l revolutions t ie pointer 57 will be from the pointer 59. The rings can be locked together bv ineens of a screw so that the angular relation between the pointers of the ringe will not be accidentally changed.

We claim:

1. A thread milling machine comprising a work spindle, a tool spindle, means for ro- When the secondary drive shaft` The hand wheel 5() is then rotated atl sus"u ion tating each, a movable support for one"of said spindles, a lead screw operatively conneeted with said support and adapted t'o act-nate the same, intermediary spindles, a train of gearing upon said spindles respectively in part adapted to connect said work rotating means with said lead screw, a plurality of said intermediary spindles being rotatable at dilierent speeds and having pro jecting ends to serve as alterna-tive driving studs one unit of said train of gearin being detachably securable u n one of t e pro jecting spindle ends w ereby one or the other of the latter becomes an active unit of said connection. n

2. A thread milling machinecomprising a work spindle, a tool spindle, means for roi tating each, a movable support for one of said spindlesaa lead screw operatively com nected with said support end adapted to ectuate the same,1gear train spindles, geni`- ing connectin one of said gear train spindles with said lead screw, a plurality of said gear train spindles 'having outwardly rejecting ends disposed in the same vertiea lane whereby the initial power unit of said indexing4 train may be shifted from one to the other and means forrotatably locking the selected initial power unit with the selected outwardly projecting end, y

3. A thread milling machine comprising a work holder, a tool holder, means for rotating one 0f said holders, a movable support for one of said holders, a, device operatively connected with said support and adapted to actuate the same,.auxiliary spindies, change speed gearing upon said auxiliary spindles whereb to rotate two of them at different spee s, said two spindles having end portions in the same plane, and a train of indexing gears each adjustable t0 all of its units within said plane and adapted collectively to connect either one of said auxiliary spindle ends with said device whereby tocause the latter to functionate, said auxiliary spindle ends being splined, and a securing init for holdin one unit of said change speed gearing in p ace upon one o-r' said splined ends.

4. A thread milling machine comprising n werk holder, a too! holder. means for rotatsaid '.gear train spindles, a `train of indexing gears adapted to connect ing one of said holders, a movable support for one of said holders, a device operatively connected with said support and adapted t0 actuate the same, spindles, 'change speed gearing upon said spindles whereby to rotate two at diiferent speeds, said two spindles having portions in the same plane, and a trainof indexing gears each adjustable as a unit within said plane and adapted collectively to connect either of said spindle portions with said device Whereby to cause the latter to unctionate, and means for cilecting"operative connection between one oi' said indexing gears and one of said pairxof spindle portions.

5. A thread milling machine comprising a work holder, :i tool holder, means for rotating one of said holders, a movable support for one of said holders, a device operatively connected with said support and adapted to aetuate the same, spindles, change speed gearing upon said spindles and operatively connected with said rotating means whereby to rotate two at different speeds said two spindles having proiecting spline end portions, and a train of indexing gears some of which are adjustable and adapted collectively to connect either one of said spindle ends with Said device whereby to cause the latter to fnnctionate, one unit of said train being furthermore detachably connected with one of said pair of splincd spindle ends, and means for Securing such detachable unit in place.

Signed by iis, this 28th dny of December, i917.

CHARLES H. SCHURR. ERNEST J. LEES. 

